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Starving Student PCB's - Page 10

post #136 of 323

Fred/ Guys, do you think this PS would work? I want to build the PS into the case.

 

It is a switching type rated at .313a at 48V DC

(I think the orig SS used 350ma wall wart with a plug cord)

 

http://www.mouser.com/ProductDetail/Mean-Well/RS-15-48/?qs=sGAEpiMZZMsi5STK09QP%252bCkHnllB9KyW


Edited by Can Junkie - 12/14/13 at 8:32am
post #137 of 323

The original used a .38A (or 380mA) PS. The .313A might not be enough to get it up and running. You planning on using some LEDs with it? Power LED, tube LEDs? The tube heater draws 150mA of current, and since you have two tubes both will draw 300mA of current. Throw in a LED or two tube LEDs and your proposed PS runs out of juice pretty fast.


Edited by Beftus - 12/15/13 at 2:40am
post #138 of 323
Quote:
Originally Posted by Beftus View Post
 

The original used a .38A (or 380mA) PS. The .313A might not be enough to get it up and running. You planning on using some LEDs with it? Power LED, tube LEDs? The tube heater draws 150mA of current, and since you have two tubes both will draw 300mA of current. Throw in a LED or two tube LEDs and your proposed PS runs out of juice pretty fast.


Yeah I was a thinking along those lines too. Just needed to hear it from another. I'm an overbuild type guy myself when it comes to that type of stuff. It is a neat little rig. Maybe I can find a bigger one just like it. If I do, I will post it.

post #139 of 323

Ok, here we go guys:

 

PS for SS Board:

 

less than $13, switching type 86 to 240V ac input, 48VDC at .75 amps!

 

Is there any reason why this switching PS mounted in the case, would not work??

 

http://www.trcelectronics.com/View/Mean-Well/EPS-35-48.shtml

post #140 of 323
Thread Starter 

That looks like a reasonable choice, dont forget on the original design of the SS the power supply was effectivly overloaded while the heaters were cold and it would cut out and cycle a couple of times, so they are pretty tough

 

cheers

FRED

post #141 of 323
Quote:
Originally Posted by Fred_fred2004 View Post
 

That looks like a reasonable choice, dont forget on the original design of the SS the power supply was effectivly overloaded while the heaters were cold and it would cut out and cycle a couple of times, so they are pretty tough

 

cheers

FRED


I was hoping it might be large enough to avoid the unit going into overload. (hope it auto resets)If each heater only draws 150ma I should be ok. I would have say 300ma left over with 100ma for other sys draws.

post #142 of 323

Should be ample current for it. Enough for adding a bunch of LEDs too.

post #143 of 323
Quote:
Originally Posted by Beftus View Post
 

Should be ample current for it. Enough for adding a bunch of LEDs too.


I think this is the one I will go with. 90 to 260ACV input.

A whopping  1.36A at 48VDC. Only $15.50. This baby will be loafing in the SS no matter how many LED's are used.

 

http://www.trcelectronics.com/View/Mean-Well/EPS-65-48.shtml

post #144 of 323
Hi,

I would like to buy 3 of your boards if they are still available.

Thanks,
Dennis
post #145 of 323
Thread Starter 

PM'd

 

cheers

post #146 of 323

For anyone looking for a power supply...I literally have 100's of the cisco power adapters for sale.  I would sell them for $10 if you are interested.  Just send me a PM.

 

They are Cisco part number:  34-1977-03       48V, .38A

 

Thanks!

--Dustin

post #147 of 323

 

I looked through your list and noticed that C3A and C5A are 250 v rather than the 63v mentioned in Fred's BOM.  Thank you for your time and work by the way, it made a big difference. Take care 

post #148 of 323

Hi All;

 

A few pages back there was a post or 2 asking about a pot that would fit the PC board.  PN# 652-PDB182_K430K-503A from Mouser fits likke a glove.

It's a Bourns, 50K audio pot.

 

Jim

post #149 of 323
Just finished soldering all parts... only to be able to hear only from the left channel, right channel giving me loud humming noises. I have checked all contacts and replaced the opamp and LM317 which helped a bit. What should I do next?
post #150 of 323
Thread Starter 

You need to post some pictures

 

what opamp??

LM317??

 

cheers

FRED

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